<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>concat</title>
</head>
<body>
<script>
    var arr1 = [1, 2, 3];
    var arr2 = ["a", "b", "c"];
    var arr3 = ["千古壹号", "vae"];
    var result1 = arr1.concat(arr2);
    var result2 = arr2.concat(arr1, arr3);

    console.log("arr1 =" + JSON.stringify(arr1));
    console.log("arr2 =" + JSON.stringify(arr2));
    console.log("arr3 =" + JSON.stringify(arr3));

    console.log("result1 =" + JSON.stringify(result1));
    console.log("result2 =" + JSON.stringify(result2));
</script>
</body>
</html>